GOSUB and SCREEN and closer reading....

[William Randall]

I used this in a class that I gave to demonstrate filePro logic on the 
screen command.  If you try it, you might understand it better or you may 
just understand from reading it.

top:::
::msgbox "Now I am proceessing from the top of the table where I belong":
::end:
@keys:::
::gosub chkthis:
::msgbox "Made it back to where I started" ; goto top:
chkthis:::
::screen "0":
::msgbox "I came back here":
::msgbox "I think I should return" ; return:

Bill

----- Original Message ----- 
From: "Fairlight" <fairlite at fairlite.com>
To: <filepro-list at lists.celestial.com>
Sent: Friday, February 17, 2006 4:22 PM
Subject: Re: GOSUB and SCREEN and closer reading....


> Y'all catch dis heeyah?  Tyler been jivin' 'bout like:
>> Check out the very first line of my post, Mark:
>> "This is a question more out of curiousity than anything else; I've 
>> already
>> coded around it, though it's an ugly kludge using a flag."
>
> There is that.  Apparently I forgot the first sentence by the time I'd
> reached the last.
>
>> As for the screen/end thing in a subroutine, I know it terminates
>> processing.  I am basically using it as an interrupt, like throwing an
>> exception.
>
> Ooooookay.  Weird way to do it, but ok.
>
>> But that has zero to do with the question.  I wasn't asking for someone 
>> to
>> solve the coding issue - that's trivial.  I just wanted to know if this 
>> is
>> by design or a bug.
>
> Well my guess is that it's probably under the category of "known
> limitation".  I seem to recall gosubs bridging multiple iterations of a
> table coming up before, some years back.  -Any- time you processing in a
> table and don't resolve all your GOSUB's, you leave them outstanding, if I
> remember the discussion correctly.  I don't think it's limited to SCREEN.
>
> Whether that's a bug or a design choice is open to question, if not 
> debate.
> Personally, I'd expect a stack like that to be cleared at any endpoint, 
> but
> that's possibly just me.
>
> mark->
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